Large volume preconcentration and purification for determining the240Pu/239Pu isotopic ratio and 238Pu/239+240Pu alpha-activity ratio in seawater

K. Norisuye; K. Okamura; Y. Sohrin; H. Hasegawa; T. Nakanishi

doi:10.1007/s10967-006-0026-8

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 267: Issue 1

Large volume preconcentration and purification for determining the240Pu/²³⁹Pu isotopic ratio and ²³⁸Pu/^239+240Pu alpha-activity ratio in seawater

Authors:

K. Norisuye

K. Norisuye Institute for Chemical Research, Kyoto University Uji, Kyoto 611-0011, Japan

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K. Okamura

K. Okamura Institute for Chemical Research, Kyoto University Uji, Kyoto 611-0011, Japan

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Y. Sohrin

Y. Sohrin Institute for Chemical Research, Kyoto University Uji, Kyoto 611-0011, Japan

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H. Hasegawa

H. Hasegawa Faculty of Engineering, Kanazawa University Kakuma, Kanazawa 920-1192, Japan

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, and

T. Nakanishi

T. Nakanishi Faculty of Science, Kanazawa University Kakuma, Kanazawa 920-1192, Japan

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Pages:: 183–193

Online Publication Date:: 14 Jan 2006

Publication Date:: 17 Dec 2005

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-006-0026-8

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Summary

The present paper describes a new analytical method for determining the ²⁴⁰Pu/²³⁹Pu isotopic ratio and ²³⁸Pu/^239+240Pu α -activity ratio in seawater, both of which are important parameters for determining Pu sources in the ocean. Plutonium isotopes were preconcentrated from a large volume of seawater (4700-10800 liter) by solid phase extraction using MnO₂-impregnated fibers and eluted into 3M HCl. After the elution, the Pu species of all oxidation states were converted to Pu(IV) using NaNO₂, purified by solvent extraction using thenoyltrifluoroacetone (TTA)-benzene, and concentrated in 5 ml of 0.2M HNO₂. The ²⁴⁰Pu/²³⁹Pu and ²³⁸Pu/^239+240Pu ratios in the 5-ml final solution were determined by inductively coupled plasma-mass spectrometry (ICP-MS) and α-spectrometry, respectively. A pg level of Pu, which was a sufficiently large amount for the determination, was obtained by the solid phase extraction. Through the redox conversion and solvent extraction, the Pu species, such as Pu(III), Pu(IV) and Pu(VI), were collected at a high recovery of 96±2% (n=3) despite the presence of large amounts of Mn, and interfering ²³⁸U (3.3 µg^. l^-1in seawater) was effectively removed with a decontamination factor of 1.7·10⁷. The accuracy of the method for the ²⁴⁰Pu/²³⁹Pu ratio was verified using reference materials of seawater and a terrestrial soil sample. The present technique was applied to the determination of the ²⁴⁰Pu/²³⁹Pu and ²³⁸Pu/^239+240Pu ratios in coastal and oceanic water.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)